Broken usageIdSuffix option

[vchrm]

@kisenka @AlexDubok Hi guys! Firstly, thanks for all the great work. I am verry happy that we are probably going to have SVG sprites when using webpack 4 again \o/.

I am trying to make this work in our project and it seems to me that the usageIdSuffix in spriteConfig does not work properly.

It propagates to the resulting CSS file (all fragments contain the suffix), however, the ids in the resulting SVG sprite do not contain the suffix.

So if I am getting this right, basically when you use other than empty usageIdSuffix, the relations between images in the CSS file and in the SVG sprite break.

I guess related PR: #56

Thanks and have a nice day.

[vchrm]

Why do we even need usageIdSuffix when you can specify symbolId parameter to eg. [name]-my-suffix and it works the same? (And this one really works.)